Armature for dynamo-electric machines



(No Model.)

M. WADDELL 8: J. B. ENTZ. ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 516,170.

Patented Mar. 6, 1894.

i B I F 771 IN;ENTORS w 406% @009 K W WITNESSES:

UNITED STATES PATENT OFFICEQ MONTGOMERY \VADDELL AND JUSTUS B. ENTZ, OF BRIDGEPORT, CON- NECTICUT, ASSIGNORS TO THE VVADDELL-ENTZ COMPANY, OF EST VIRGINIA.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 516,170, dated March 6, 1894. Application filed May 13, 1893- Serial No. 474,120. (No model.)

To aZZ whom it may concern:

Be it known that we, MONTGOMERY WAD- DELL and JUsrUs B. ENTZ, residing at Bridgeport, Fairfield county, Connecticut, have invented an Improvement in Dynamo-Electric Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, inwhich Figure l is a side view of an armature with parts broken away to better illustrate other parts. Fig. 2 is a central vertical section of the same.

This invention relates to that class of dynamo electric machines wherein the fieldmagnet is located within a ring-armature and in which either the field magnet or the armature may be rotated,and said invention consists in the construction of the ring-armature substantially as hereinafter described and claimed. Heretofore in constructing ring-armatures the bolts which secured the armature plates, passed entirely through them and through the side disks which held said plates in place; consequently said bolts passed through the magnetic circuit, causing induced currents to be maintained in them, unless insulated from the armature plates and side disks. Furthermore said bolts occupied a space by passing through the armature plates which could not be made available for maintaining the magnetic circuit, thus rendering it necessary in order to have a proper-capacity to make the armature of a size sufficient to compensate for the space occupied by the bolts. It has also been customary to make one of the side fastening rings and spider all in one piece, and when so constructed of iron, was objectionable on account of the magnetic properties thereof, whereas if it was constructed of a non-magnetic metal, such as brass, the cost of construction was considerable.

The object of our invention is to overcome these difficulties heretofore found in ring armatures.

In the drawings A represents a driving shaft, upon which a spider B is carried, that is, assuming that the armature is to be rotated.

at designates an outer fastening disk or ring of our improved ring armature, which is a separate piece made of non-magnetic metal, such as brass, and is attached to the spider B, which is made of iron or other cheaper metal whether said metal be magnetic or not, as indicated at b. This fastening disk or ring a is provided with outwardly extending lugs 0 around its entire periphery, which lugs are adapted to receive boltscl for purposes which will be hereinafter described.

9 represents a fastening disk or ring on the opposite side of the armature from that of the ring a, and provided with outwardly extending bolt-receiving-lugs f constructed and spaced similar to the lugs c of the fastening ring a.

g designates the armature plates, which may be constructed and insulated one from the other in the usual manner.

The two fastening rings a and e are first secured together (with the armature plates g interposed) by means of the bolts d, and then the coil h can be wound around the armature in the usual manner, and may be covered with an insulating material on the outer surface as shown at t'.

It will be observed that by placing the fastening lugs on the outer periphery of the fastening rings, as described, no space is occupied which would be available for the coil or other purposes, inasmuch as said lugs merely occupy a space equivalent to the difference between the outer and inner circumferences of the armature; the winding surface for the coil is of course controlled by the inner circumference, so that the lugs merely occupy space that otherwise would be unoccupied. It will also be observed that in our construction the fastening bolts d form a guide for assemblin g the armature plates and prevent said plates, when assembled, from outward movement through centrifugal force or otherwise.

By our invention we are enabled to avoid the necessity of insulating each of the fastening bolts ((1) from the armature plates and fastening rings (as in armatures heretofore made), since the bolts do not pass through the magnetic circuit of the armature.

It is obvious that by our invention we can construct a ring armature at less cost having the same capacity and occupying much less space than structures heretofore made, since the space which in former constructions was occupied bya large number of insulated fastening bolts passing through the armature, in

5 our construction is made available for the armature itself, for maintaining the magnetic circuit. This feature we deem of great importance in this character of armatures, wherein it is desirable to obtain the most 10 possible capacity from the least bulky and weighty construction, and by combining magnetic and non magnetic metals as described,

2. In an armature of the characterdescribed, the combination of armature plates g, fastening rings a e having lugs projecting outwardly from the peripheries thereof, and securing bolts d adapted to unite the fastening rings 30 without passing through said armature plates, substantially as described.

3. In an armatureof the characterdescribed, the combination of armature plates g, fastening rings a, 6, having outwardly extending 35' lugs thereon, bolts (1 adapted to unite said fastening rings without passing through said armature plates, and coil h wound between the said lugs and bolts, substantially as described. 0

4. In an armature of the characterdescribed, the combination of a spider B of magnetic metal and fasteninga of non-magnetic metal united thereto, substantially as and for the purposes set forth. MONTGOMERY WADDELL. JUSTUS B. ENTZ. Witnesses:

CHARLES E. SMITH, L. M. WAOHSOHLAGER. 

